Let's divide 435478 by 15
The aim is to understand the frequency of 15 in 435478.

Advancing to step 1:
15 can be fit into 4 0 times, resulting in a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Take the next digit (3) from the dividend and append it to 4, then repeat: 43 / 15

Advancing to step 2:
43 divided by 15 is 2 with a remainder of 13.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtracting 30 from 43 leaves us with 13.
Take the next digit (5) from the dividend and append it to 13, then repeat: 135 / 15

Step 3:
15 can be fit into 135 9 times, resulting in a remainder of 0.
Put 9 as the next digit of the answer. 
Result so far: 29.0
If we take 135 away from 135, we end up with 0.
Append the next digit (4) from the dividend to 0 and continue with: 4 / 15

Going ahead to step 4:
The number 15 fits into 4 0 times, leaving a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 290.0
The remainder is 4 after subtracting 0 from 4.
Fetch the next digit (7) from the dividend, attach it to 4 and continue: 47 / 15

On to step 5:
15 can be fit into 47 3 times, resulting in a remainder of 2.
Put 3 as the next digit of the answer. 
Result so far: 2903.0
If we subtract 45 from 47, we get 2.
Append the next digit (8) from the dividend to 2 and continue with: 28 / 15

Going ahead to step 6:
If we divide 28 by 15, we get 1 and a remainder of 13.
The next digit of our result is 1. 
Result so far: 29031.0
If we take 15 away from 28, we end up with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Going ahead to step 7:
15 goes into 130 8 times with a remainder of 10.
Put 8 as the next digit of the answer. 
Result so far: 29031.8
If we take 120 away from 130, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 8:
15 can be fit into 100 6 times, resulting in a remainder of 10.
Write down 6 as next digit of the result. 
Result so far: 29031.86
Subtract 90 from 100 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 9:
When dividing 100 by 15, we get 6 with a remainder of 10.
Record the quotient 6 as the next digit in the result. 
Result so far: 29031.866
Subtracting 90 from 100 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final result is 29031.866 with a remainder of 0.001.